Influence of Laser Shock Peening and Ultrasonic Nanocrystal Surface Modification on Residual Stress, Microstructure, and Corrosion–Fatigue Behavior of Aluminum 7075-T6

Aluminum 7075-T6 alloy was subjected to Laser Shock Peening without Coating (LSPwC) and Ultrasonic Nanocrystal Surface Modification (UNSM) to boost fatigue performance in both air and corrosive environment. Severe plastic deformation (SPD) caused by UNSM treatment induced significantly higher (~3.5 ...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2023-11, Vol.54 (11), p.4233-4252
Main Authors: Sharma, Anurag, Song, Jie, Furfari, Domenico, Mannava, Seetha R., Vasudevan, Vijay K.
Format: Article
Language:English
Subjects:
Alloys
Aluminum alloys
Aluminum base alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Compressive properties
Corrosion fatigue
Corrosion rate
Corrosion resistance
Crack initiation
Discount coupons
Engineering
Fatigue life
Laser shock processing
Lasers
Materials fatigue
Materials Science
Metal fatigue
Metallic Materials
Microstructure
Nanocrystals
Nanotechnology
Original Research Article
Peening
Plastic deformation
Residual stress
Scanning electron microscopy
Shock waves
Stress concentration
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary:Aluminum 7075-T6 alloy was subjected to Laser Shock Peening without Coating (LSPwC) and Ultrasonic Nanocrystal Surface Modification (UNSM) to boost fatigue performance in both air and corrosive environment. Severe plastic deformation (SPD) caused by UNSM treatment induced significantly higher (~3.5 × ) surface compressive residual stress than LSPwC, while the intense shockwaves generated by LSPwC introduced ~ 3 × higher depth of compression. Electrochemical results confirmed improved polarization resistance and reduced corrosion rate post LSPwC, which is mainly attributed to its oxide layer and near-surface microstructural homogenization. Changes in the mechanical and corrosion behavior of the alloy after LSPwC produced up to ~ 650 pct augment in corrosion–fatigue life over base material while UNSM improved the performance by up to ~ 250 pct. Graphical Abstract
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-023-07159-w